You might as well have a return welded into the mash tun if you plan to recirculate.

The HLT only needs a bulkhead to drain unless you want to incorporate some type of fill port or an inner coil for a herms or something.

1/2" full couplings welded nearly flush to the skirt welds on the bottom for the drain ports and then wherever you decide for the other ports.

Alright ! Think I got it, the same couplings/bulkheads that I am using for the 1/2 Ball Valve & Sight glass / Thermometer combo I would use for the Sparge/Recirculation ports.
I think I will put one in to the HLT as well, and if I don't need it just plug it. I was thinking this would be good for cleaning ??? any thoughts ???

Do you ship up to Canada ???? Having a very hard time finding parts for All Grain home Brewing up my way.

If you're paying the welder by the hour and you're getting a good deal, I'd put in more ports than you need. Just as an example, you may think you want a direct fired MLT but in the end, you might want a HERMS coil in the HLT.

HLT: 1/2" drain (I'd seriously consider putting this dead center at the bottom of the dish for complete draining without no diptube), 1/2" coupling for thermometer. 1/2 or 1/4" half coupling for sight gauge. The advantage of breaking them up into two ports is that you can put the sight port nice and low while the thermo is up a few inches for easier viewing and a slightly more average temp reading. If you go with the HERMS ports, in general one goes near the bottom and one about 2/3rds of the way up from there, say just above the top bumped out ring.